Safety-door for heaters



(No Model.)

J. H. MASON.

SAFETY DOOR FOR HEATERS. 1m 398,271.

Patented Feb. 19, 1889.

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UNITED STATES PATENT OFFICE.

JAMES H. MASON, OF DETROIT, MICHIGAN.

SAFETY-DOOR FOR H EATERS SPECIFICATION forming part of Letters Patent No. 398,271, dated February 19, 1889. Application filed May 3, 1888. Serial No. 272,691. (No model.)

T0 at whom it may concern.-

Be it known that 1, JAMES H. MASON, of Detroit, in the county of WVayne and State of Michigan, have invented a new and useful Improvement in Safety-Doors for Boilers, of which the following is a specification.

My invention consists in an improved safety-door for boilers, especially applicable to car-l'lcaliers, hereinafter fully described and claimed.

The drawing is a perspective showing the upper safety-door and fire-door open and the lower safety-door and ash-pit door closed.

A represents the boiler, which may be of any shape or style of construction.

I represents the stokin g-hole, provided with the ordinary swinging fire-door, E.

B B represent vertical guides secured to the boiler, one at each side of the fire-door, and C represents a perpendicular plate of iron, whose ends fit and slide vertically in said guides B.

hen the boiler is cylindrical, as illustrated in the drawing, the plate C is made to conform to the shape of the boiler. The plate 0 has a number of fine perforations therein to permit air to pass through, the plate, but are not large enough to let sparks or fire pass out, and is provided with ahandle, N, by which it may be raised. The plate 0. is adjusted to slide douuiward in the guides B down to a point where it completely covers the door E, and is there prevented from fur-.

. ther down ward motion by any suitable stop I the descent of the plate C the arrow-head D separates these spring-jaws and is clamped between them.

It is evident that any other automatic look ing device may be substituted in place of the one shown.

1) represents a plate similar to C, provided with perforations and a handle, M, and a looking device, which plate also slides in the guides B, and when down covers the ash-pit door of the heater.

I am. aware that a horizontallymoving plate adapted to cover the ash-pit and firedoors of a heater has been shown and described in a prior patent; but this differs from my invention in that said plate must be closed by hand after the fire and ash-pit doors are closed, while in my device the safetyplates C and L close by gravity, thus rendering the device automatic.

It is evident that the fire-door E cannot be opened until the plate C is raised, and that the instant the fire-door is closed the plate 0 falls over it and is locked in position, forming an absolute automatic safety-door.

'hat I claim as my invention, and desire to secure by Letters Patent, is

The combination, with a heater having an opening and closing door, of avertically-sliding plate on the heater, whichis supported in its elevated position by the door when thelatter is open, and drops down in front of the door whenever the latter is closed, and an automatic locking device for holding the sliding plate in its lowest position when it drops down in front of the closed door, substantially as described.

JAMES H. MASON.

Witnesses:

CYRUs E. LoTHRoP, ADELAIDE A. ANDERSON, 

